Guests visit a hall of armored vehicles made by a Turkish company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

People visit a weapons booth of the Republic of Azerbaijan in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

People visit a German company's missile booth in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Visitors pass by a truck of air defense missile system made by EUROSAM company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Guests visit the booth of Boeing company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Guests talk with each other in front of an Italian company's warship model in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

A visitor experience an armored vehicle made by Mercedes-Benz in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Guests view an armored vehicle of fire control system made by a Turkish company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

A representative of the Turkish company introduces the F-16 fighter to a visitor in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

A guest asks the staff about the T129 multirole combat helicopter shown by TAI company of Turkey in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

A guest sitting inside an armored vehicle operates the instrument in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

A military officer visits a Turkish firearms company booth in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Guests visit the booth of French Airbus company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

Guests talk with each other in front of the booth of an aircraft company from France in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)

People visit a booth of a Switzerland-Germany firearms company in Istanbul, Turkey, May 7, 2013. The 11th International Defence Industry Fair was opened on Tuesday, with 781 companies from 82 countries and regions attending the four-day fair. (Xinhua/Lu Zhe)